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Thread: Injector Flow Rates?

  1. #1
    Fast Ted Guest

    Default Injector Flow Rates?

    Hi, it's been a long time but I'm needing help again. Can anyone tell me the difference between the red 250R-51AA injectors and the white 250R-123AA injectors? Flow rate? Impedance? Best ones to use on a 900 equipped 1/8 mile drag car? Is there a better upgrade? Where to purchase? Thanks a bunch. Ted

  2. #2
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    Quote Originally Posted by Fast Ted View Post
    Can anyone tell me the difference between the red 250R-51AA injectors and the white 250R-123AA injectors? Flow rate?
    Are these the older, black, round top, B2 injectors?
    Or the newer Delphi, harness connector top injectors?
    Do you know the lb/hr rating of these injectors? (I deal with Holley part numbers.)

    Impedance?
    All of Holley's TBI units use low impedance injectors.

    Best ones to use on a 900 equipped 1/8 mile drag car?
    It depends on the horsepower of the engine, not the vehicle.

    Is there a better upgrade?
    The new Delphi TBI injectors are better than the old B2 TBI injectors:
    http://www.holley.com/534-169.asp (injector pod upgrade kit)
    http://www.holley.com/522-43.asp (85 lb/hr injectors)
    http://www.holley.com/522-80.asp (75 lb/hr injectors)

    Where to purchase?
    http://www.holley.com/types/Commande...ce%20Parts.asp
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" Dart SBF, TFS TW 11R 205 heads, 11.8:1 comp, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3
    Fast Ted Guest

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    Hi Danny. This is an older Pro-Jection system. My car is a '66 Ranchero weighing in at 3030 lbs. wet. Easy breathing 460 backed by a C-6 and 3.70 gears. Recently installed AFR gauge shows a bit lean on the top end and I'm running out of adjustment on the knobs. Are Pro-Jection injectors even available anymore? Thanks for getting back to me and have a great day!

  4. #4
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    Connecticut
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    Quote Originally Posted by Fast Ted View Post
    Are Pro-Jection injectors even available anymore?
    No, they're obsolete. The Delphi injectors I linked above, are available.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" Dart SBF, TFS TW 11R 205 heads, 11.8:1 comp, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  5. #5
    Fast Ted Guest

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    Guess it's time to upgrade. Thanks again for your help.

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